A high-quality gray scale printing is attained by using an ink jet
recording head having a simple and low-cost configuration and a
general-purpose structure, and ink having common components.
An ink jet recording head driving method to be disclosed comprises
repeating a plurality of times a dot forming process for forming a
plurality of dots on a recording medium, while an ink jet recording head
is moved in a sub-scanning direction; the process comprising the steps of
moving the ink jet recording head in a main scanning direction, generating
a plurality of drive waveform signals according to a jet amount of ink
droplets, selecting any one or none of the plurality of waveform signals
for each of a plurality of nozzles according to gray scale information of
printing data, and applying voltage to corresponding piezolectric
actuators.
